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IXPE

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NORAD ID: 49954
Int'l Code: 2021-121A
Perigee: 543.0 km
Apogee: 553.3 km
Inclination: 0.2 °
Period: 95.5 minutes
Semi major axis: 6919 km
RCS: Unknown
Launch date: December 9, 2021
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 49954U 21121A   26016.58336806  .00010660  00000-0  60774-3 0  9992
2 49954   0.2327  22.3847 0007455 303.0507 108.0912 15.08421858  5785
Source of the keplerian elements: AFSPC